Johannes Kepler

After the heliocentric model was banned, Johannes Kepler, a German mathematician, developed a keen interest and later published a public defense of Copernicus' theories.

Corpernicus' model still had flaws in predicting planetary motion. Kepler theorized that planetary bodies orbit along an elliptical path, and not perfect circles as Ptolemy and Copernicus had assumed.

Kepler also made other notable discoveries.